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Das, Kaberi
- Role of Magnesia as an Additive on Sintering and Micro-Structural Characteristics of Indian Bauxite
Authors
1 Department of Metallurgical & Materials Engineering, Jadavpur University, Kolkata-700032, IN
2 Department of Ceramic Technology, Government College of Engineering & Ceramic Technology, Kolkata – 700010, IN
Source
Indian Science Cruiser, Vol 28, No 4 (2014), Pagination: 10-15Abstract
Raw Indian Bauxite from Saurashtra region, Gujarat is selected for experimental studies to produce refractory material after sintering with addition of chemical grade magnesia powder of variable fractions (4wt%, 8wt%, 12wt %) as sintering aid for 4hours after mixing in rubber lined pot. Powder X-Ray diffraction study confirmed the formation of spinel (magnesio- aluminate phase) along with corundum as major crystalline phase. Physical properties like bulk density, apparent porosity is measured for the prepared samples. The maximum bulk density (3.57gm/cc) is obtained with 4wt% MgO containing batch with 0.53% of apparent porosity fired at 1500oC. Maximum shrinkage (29.59%) is attained at 1550oC with no additive batch. The elongated corundum crystals and rectangular spinel phase is observed in the thermally etched polished surface of the magnesia containing bauxite batch.